A British official said that this impractical policy could be changed , the future for Britain was indeed dark.
A. unless
B. when
C. if
D. until
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(答案→)A. unless
B. when
C. if
D. until
解析：考查连词：A．unless 除非，B. when当…时候， C.if如果，D.until直到，句意：一个英国官员说：英国的未来会很黑暗除非这个不实用的政策被改变。选A。